When talking about someone's romantic interests, the term "bit of fluff" is often used to describe someone who is seen as temporary or insignificant. However, using this phrase can come across as derogatory or objectifying. If you're looking for more respectful alternatives, consider using synonyms like "romantic partner," "significant other," or "love interest." Other options might include "boyfriend" or "girlfriend" if the relationship is more defined. If you're trying to emphasize the casual nature of the relationship, consider phrases like "casual dating partner" or "romantic acquaintance." Ultimately, it's important to consider the tone and context in which you're using these phrases to ensure that you're communicating respectfully and without judgment.